4 layers90.2 × 95.9 mm
4 layers22 × 51 mm
Btaudio
KingJacker/btaudioEin kompromissloses Wireless-Upgrade-Modul für Kabelkopfhörer. Kein All-in-One-Kompromiss — stattdessen drei dedizierte Stufen für maximale Klangqualität ohne Hintergrundrauschen.
- Size
- 22 × 51 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 50
- Nets
- 72
- Pads
- 211
- Tracks, vias
- 410, 135
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 6 May 2026
- Updated
- 15 Sep 2026
Overview
Btaudio is an open-source printed circuit board by KingJacker, from the KingJacker/btaudio repository on GitHub. It is a 4-layer board of 22 × 51 mm with 50 parts on 72 nets, routed with 410 tracks and 135 vias.
It is built around the EWM104-BT5125 and PCM5102AQPWRQ1. Its parts include 25 capacitors, 7 resistors, 4 ICs, 4 connectors and 2 diodes.
Main components
2README
README.mdbtaudio — Audiophiles Bluetooth 5.1 Upgrade-Board für Kopfhörer
Ein kompromissloses Wireless-Upgrade-Modul für Kabelkopfhörer. Kein All-in-One-Kompromiss — stattdessen drei dedizierte Stufen für maximale Klangqualität ohne Hintergrundrauschen.
Architektur
QCC5125 (BT 5.1) →[I2S]→ PCM5102A (DAC) →[Analog]→ TPA6132A2 (Amp) → Kopfhörer
Empfang Wandlung VerstärkungStufe 1 — Empfang: QCC5125 empfängt High-Res-Audio via aptX HD / LDAC und gibt das Signal rein digital (I2S) weiter. Keine Funkstörungen im Analogpfad.
Stufe 2 — Wandlung: PCM5102A (High-End-DAC) wandelt das I2S-Signal in ein sauberes analoges Audiosignal. Dedizierter Chip statt integriertem DAC-Billigst-Lösung.
Stufe 3 — Verstärkung: TPA6132A2 treibt die Kopfhörer direkt an ("Capless"-Design) — keine Elektrolytkondensatoren im Signalweg, die den Klang verfärben.
Schaltplan
Platine (3D-Ansicht)
Ziel
Alte, hochwertige Kabelkopfhörer auf modernes audiophiles Bluetooth-Niveau heben — durch konsequente Trennung von Funk, DA-Wandlung und Verstärkung.
Hardware
- BT-Modul: Qualcomm QCC5125 (Bluetooth 5.1, aptX HD, LDAC)
- DAC: Texas Instruments PCM5102A
- Amp: Texas Instruments TPA6132A2 (Capless Headphone Amp)
- Design-Tool: KiCad
Parts
50| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 1uF | Capacitor_SMD:C_0805_2012Metric | C4, C5, C7, C21, C22, C23, C33 |
| 5 | 100nF | Capacitor_SMD:C_0805_2012Metric | C8, C13, C14, C24, C26 |
| 5 | 10uF | Capacitor_SMD:C_1206_3216Metric | C11, C25, C27, C30, C31 |
| 4 | 2.2uF | Capacitor_SMD:C_0805_2012Metric | C15, C16, C32, C34 |
| 2 | 1k | Resistor_SMD:R_0805_2012Metric | R14, R15 |
| 2 | 2.2nF | Capacitor_SMD:C_0805_2012Metric | C28, C29 |
| 2 | 470 | Resistor_SMD:R_0805_2012Metric | R10, R11 |
| 2 | 5.1k | Resistor_SMD:R_0805_2012Metric | R4, R5 |
| 2 | LED | LED_SMD:LED_0805_2012Metric | D4, D5 |
| 2 | NC | Capacitor_SMD:C_0402_1005Metric | C17, C18 |
| 1 | 0 Ohm | Inductor_SMD:L_0402_1005Metric | L1 |
| 1 | 10k | Resistor_SMD:R_0805_2012Metric | R12 |
| 1 | Audio | Aux-Pads:aux-pads | J3 |
| 1 | BTNS | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | Battery | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J6 |
| 1 | EWM104-BT5125 | EWM104-BT5125-PCB:EWM104-BT5125(KiCAD)_flipped_nonhole | U1 |
| 1 | GAIN0 | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | GAIN1 | Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm | JP2 |
| 1 | IPEX Plug | A-1JB:A1JB | AE2 |
| 1 | LOGO | LOGO | G*** |
| 1 | MCP1700x-330xxTT | Package_TO_SOT_SMD:SOT-23 | U5 |
| 1 | NetTie | NetTie:NetTie-2_SMD_Pad0.5mm | NT1 |
| 1 | PCM5102AQPWRQ1 | PCM5102AQPWRQ1:SOP65P640X120-20N | U2 |
| 1 | POWER_SW | Button_Switch_SMD:SW_SPST_TS-1088-xR020 | SW1 |
| 1 | SOFT RESET | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | SW6 |
| 1 | TPA6132A2RTET | TPA6132A2RTET:QFN50P300X300X80-17N-D | U3 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J2 |
Questions
How big is the Btaudio PCB?
It measures 22 × 51 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Btaudio use?
50 parts, built around the EWM104-BT5125 and PCM5102AQPWRQ1. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Btaudio KiCad files?
From the KingJacker/btaudio repository on GitHub, at the commit this page was made from: the board is btaudio/btaudio.kicad_pcb and its schematic btaudio/btaudio.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Btaudio design in my own project?
Its repository states no licence, so its author keeps all rights: ask KingJacker before reusing the design.
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